Install fails when .Rprofile prints to console

[jrowen]

I'm using install.packages("httpuv", type="source") to install on a machine that uses a .Rprofile or Rprofile.site file that prints to the console:

.First <- function() {
  cat("Custom .Rprofile")
}

The build fails with a No such file or directory message, and the problem line is

g++ -m32 -shared -s -static-libgcc -o httpuv.dll tmp.def RcppExports.o filedatasource-unix.o filedatasource-win.o http.o httpuv.o md5.o set_invalid_parameter.o uvutil.o websockets-base.o websockets-hixie76.o websockets-hybi03.o websockets-ietf.o websockets.o Custom .Rprofile ./libuv/libuv.a ./http-parser/http_parser.o ./sha1/sha1.o ./base64/base64.o -lWs2_32 -lkernel32 -lpsapi -liphlpapi -Ld:/RCompile/r-compiling/local/local320/lib/i386 -Ld:/RCompile/r-compiling/local/local320/lib -LC:/PROGRA~1/R/R-32~1.0/bin/i386 -lR
g++.exe: error: Custom: No such file or directory
g++.exe: error: .Rprofile: No such file or directory

It appears that the cat output from the .Rprofile on this machine is being inserted into the g++ command. After removing the cat call, the library installs without error.

I've been able to reproduce this error on both windows and linux machines. This may also be related to #11.

[wch]

It's probably because of this line:
https://github.com/rstudio/httpuv/blob/5b02e6e/src/Makevars#L9

If you have a cat statement in your .Rprofile, then every time R or Rscript is invoked, it'll print that message to the screen. I suggest modifying your .Rprofile so that the cat is only run in interactive sessions. For example:

if (interactive()) {
  cat('text')
}

[jrowen]

I wasn't aware of the interactive function--I'll make the update, thanks.

It also looks like Rcpp:::LdFlags() is deprecated in Rcpp v0.11.5 and returns "", so the Rscript command may no longer be needed.